France · Haute-Savoie
Bonneville Motte Longue
Haute-Savoie, France
On the beach
Right now
Sample dataIllustrative conditions — the live Open-Meteo marine feed wasn't reachable, so these are deterministic placeholder values that will be replaced automatically once the feed is available.
7-day outlook
Sample dataModeled placeholder forecast for demonstration — will be replaced by a live marine-weather feed.
Sea temperature
Next 7 days, °C
Wave height
Next 7 days, metres
View as table
| Day | Sea temp (°C) | Wave height (m) |
|---|---|---|
| Wed 2 | 26.7 | 0.6 |
| Thu 3 | 26.9 | 0.6 |
| Fri 4 | 26.6 | 0.6 |
| Sat 5 | 26.1 | 0.6 |
| Sun 6 | 25.8 | 0.6 |
| Mon 7 | 25.8 | 0.6 |
| Tue 8 | 26.2 | 0.6 |
Water quality history
Official EEA classification, one rating per bathing season, 2015–2025 — real data reported by national authorities.
- 2015: Excellent2015
- 2016: Good2016
- 2017: Good2017
- 2018: Excellent2018
- 2019: Excellent2019
- 2020: Excellent2020
- 2021: Poor2021
- 2022: Sufficient2022
- 2023: Good2023
- 2024: Good2024
- 2025: Excellent2025
Excellent in the most recent season, and 9 of 11 classified years rated Excellent or Good.
- Excellent
- Good
- Sufficient
- Poor
- Not classified
View as table
| Year | Classification |
|---|---|
| 2015 | Excellent |
| 2016 | Good |
| 2017 | Good |
| 2018 | Excellent |
| 2019 | Excellent |
| 2020 | Excellent |
| 2021 | Poor |
| 2022 | Sufficient |
| 2023 | Good |
| 2024 | Good |
| 2025 | Excellent |
Typical sea temperature by month
Modeled estimatePlausible seasonal climatology derived from latitude, for illustration — not a measured average.
Monthly sea temperature
Typical range across the year, °C
View as table
| Month | Typical sea temp (°C) |
|---|---|
| Jan | 15 |
| Feb | 14 |
| Mar | 15 |
| Apr | 17 |
| May | 20 |
| Jun | 23 |
| Jul | 25 |
| Aug | 25 |
| Sep | 25 |
| Oct | 23 |
| Nov | 20 |
| Dec | 17 |
Location & nearby beaches
Nearby beaches
- Thyez Municipale9.8 kmHaute-Savoie
- Morillon Municipale20 kmHaute-Savoie
- Sallanches Ilettes21 kmHaute-Savoie
- Les Gets Municipale22 kmHaute-Savoie
Distances calculated as straight-line (haversine) from official coordinates.
Getting there & around
- Easy by car — there's parking close to the beach.
- Nearest bus stop is about ~510 m away.
Food, stays & town
- Nearest town: Bonneville, about ~1.3 km away.
- 1 place to stay mapped nearby Closest is Hôtel & Restaurant des Alpes, about ~1.2 km away.
- 6 shops nearby, the closest about ~560 m away
What kind of beach is this?
This beach belongs to a small coastal village. It's usually calmer than a resort or town beach, though a popular village spot can still fill up on the best summer days.
Estimated from OpenStreetMap surroundings data (ODbL).
- Water sports
Is the water clean at Bonneville Motte Longue?
Bonneville Motte Longue is a lake bathing site with an official EU Bathing Water rating of Excellent for the 2025 season — the highest official classification under the EU bathing-water assessment. That annual classification comes from the EU Bathing Water Directive: national authorities test for two indicator bacteria, intestinal enterococci and E. coli, throughout the bathing season, then report the full-season results to the European Environment Agency (EEA) the following spring — the 2025 season's rating was published in spring 2026, and the 2026 season won't be rated until spring 2027. In addition to that yearly rating, some national authorities — for Croatia, the national environmental authority — publish individual water sample results during the season itself, ahead of the annual report. On site you'll find Parking and Sports facilities. You can park about ~30 m away.
Over the 11 classified seasons on record, 9 have come back Excellent or Good — a track record worth checking each year rather than assuming. If you're timing a visit around water temperature rather than crowds, July–September is the safest bet, with August typically the peak — expect a cooler, calmer sea either side of that stretch. Bonneville — the closest town — sits about ~1.3 km from here.
That “Excellent” label comes from a full season of official water sampling, not a single test — it's one step on a four-point scale (Excellent, Good, Sufficient, Poor) reassessed once a year. Today's actual conditions can differ from the seasonal average, so for a live snapshot see the “Right now” and 7-day outlook panels above. Water quality here has been improving: the rating moved from Good to Excellent in 2025.
Frequently asked questions
Is Bonneville Motte Longue a safe beach for swimming?
Yes. Its official 2025 EU Bathing Water rating is Excellent, the top classification, and 9 of the 11 classified seasons on record have rated Excellent or Good. Its rating has also been trending the right way, moving from Good to Excellent in 2025.
How warm is the sea at Bonneville Motte Longue right now?
That's placeholder data, not a live measurement: Bonneville Motte Longue's marine-weather feed couldn't be reached, so the panel above is showing an estimated ~26°C until the real feed comes back. That's the reading right off Haute-Savoie.
What's the ideal time of year to swim at Bonneville Motte Longue?
July–September is typically the most reliable swimming window, with the sea usually warmest in the second half of summer. That applies to the water around Haute-Savoie.
How is the water quality rating measured?
The grade comes from a full season of official sampling for intestinal enterococci and E. coli, reported to the European Environment Agency each spring under the EU Bathing Water Directive, which assigns Excellent, Good, Sufficient or Poor. Some countries (Croatia, via IZOR) also publish individual in-season samples ahead of that report; Bonneville Motte Longue doesn't have that feed yet.
How do I get to Bonneville Motte Longue without a car?
By car, it's easy — parking is right by the beach. There's a bus stop about ~510 m from the beach. The nearest town is Bonneville, about ~1.3 km away.